Machine tool



OL 20, 1942. I Y. E. E. KELLEY MIACHINE TooL Filved Septf-l, 1939 V Patented Oct. 20, 1942 UNITED STATES PATENT OFFICE MACHINE TOOL Elmer E. Kelley, Hartford, Conn.

Application September 15, 1939, Serial No. 294,990

(Cl. ,Z9- 53) 14 Claims.

This invention relates to machine tools.

It has among its objects to provide an improved stock stop mechanism for such a machine, and, more particularly, an improved stock stop mechanism for such a machine of the so-callecl two-ata-time type described and claimed in the Kelley Patent No. 2,201,182,.issued May 21, 1940. A further object of my invention is to provide such an improved mechanism whereby, while obtaining the desired stock stopping function, it is made possible materially to simplify the previous stock stop operating and controlling mechanism, in such manner as materially to reduce thecost of the same and, accordingly, of the machine carrying the same. A still'further object of my invention is to `provide improved stock stop mechanism disposed in an improved location relative to the tube usual in such machines, and having an improved operative connection whereby it is made possible to eliminate various mechanisms heretofore provided to control the stock stop mechanism and thereby not only substantially simplify the machine but also materially reduce the cost of the same. These and other objects and -advantages of my improved construction will, however, hereinafter more fully appear.

In the accompanying drawing, I have shown for purposes of illustration one embodiment which my invention may assume in practice.

In these drawings:

Figure 1 is a plan view, partially in section, of a two-at-a-time machine equipped with my improvement;

Fig. 2 is a perspective View of the stock stop and its operating mechanism, certain other parts of the machine being omitted to facilitate illustration, and

Fig. 3 is a partial sectional view on line 3-3 of Figure 1,- showing the stock stop in end elevation in stock stopping position, and in dotted lines in inoperative position.

In this illustrative construction, I have shown my invention applied to a two-at-a-time machine of the construction described in theKelley patent mentioned. As shown, this machine includes parallel work rotating spindles I having usual cam controlled stock gripping and feeding mechanism, generally indicated at 2; the spindles I being mounted in a usual head-stock 3, and a transverse tool slide 4 carrying pairs of tools 5 'I and 6 being reciprocable transversely so that the pair of tools 5 and 6 alternately operate on the work after it has been simultaneously fed into the path thereof by the feeding mechanism 2.

Herein, a usual gear box I on the opposite end 55 of the machine from the headstock 3 also has usual operative connections to the various parts of the feeding mechanism 2, and to the tool slide 4, while also being operatively connected through a main cam 8 and cam follower 9 to effect reverse longitudinal movements of a longitudinally reciprocable tool carrier I9 carrying suitable tools II, herein drills, which are adapted to operate longitudinally on the ends of the stock. Associated withthis mechanism is also stock stop mechanism including a member I2 having oppositely extending arms I2a and carried on a tube I3 disposed longitudinally above the carrier Iii and midway between the drills II thereon, this member I2 being actuated and controlled in such manner that the arms I2a are moved into the paths of the stock rods as the latter are fed by the feeding mechanism 2 and, after performing their usual stopping function thereon, are swung away from the ends of the stock rods to permit the oper-ation of the tools II; the operating and controlling mechanism for this member I2 herein being of an improved construction and operated in an improved manner, as hereinafter described.

Referring more particularly to this operating and controlling mechanism, it will be noted that the stock stop member I2 is herein threaded as at I4l on the tube I3. Further, it will be observed that the latter extends continuously from the front end of the head stock 3 to the hub of the cam 8 and is freely rotatable on an inner drive sleeve or tube I5 fixed to the cam 8 and through which end an inner power shaft I5a,

ypower is transmitted to the feeding mechanism,

spindles, and cross `slide in usual manner. Further, it will be'noted that on the underside of the tube I 3in rear of the threadedportion I4 thereon, a depending roller or cam follower It `is provided, and that this bottom member I6 is more particularly to the slot I`I,- it will also beobserved that the latter includes a short straight front end portion 28 near the threaded portion I4, an intermediate longer angularly directed communicating slot portion 2| disposed substantially at 45 toportion 20, and a rearwardly directed communicating slot portion 22 disposed parallel to the slot portion 20 and substantially longer than the latter and extending from the portion 2i through the rear end of the cam block I8.

In the operation of my improved construction, when the stock is fed forward by the stock gripping and feeding mechanism 2, the stock stop member I2 is disposed in the position shown in Figure 2, wherein its arms I2a are in the path of the rods of the stock, in such manner as to limit the feeding movement thereof. When, however, feeding of the stock has been completed, and as the tool carrier I is fed forward to cause its tools II to function, and While the tools or 6 on the tool slide 4 are moving into operative position, the longitudinal tool carrier I0 begins to move forward as a result of rotation of the cam 8. follower I6 on the tube I3 is deflected by the cam slot 2i, in such manner as thereby to rotate the tube I 3 and member I2 and swing the arms I2a of the latter from the full line or stock stopping position illustrated in Figure 3, to the inoperative position thereof indicated in dotted lines in that figure. Thereafter, the roller I6 enters the elongated slot 22 which retains the member I2 in this inoperative position during the remainder of the forward feeding movement of the longitudinal tool carrier I0, i. e. while the drills II are entering the work. Upon completion of the operation of these tools II, however, they tool carrier I0 is Withdrawn in a usual manner by the cam 8, the roller or cam follower IG then moving reversely in the cam slot 22, and, upon entering the slot 2|, being deflected laterally in such manner as to cause the tube I3 and member IZ to be rotated and thereby bring the arms I2a again into stock stopping position, the roller i6 remaining in the slot 20 while these arms are in this position.

As a result of my improved construction, while operating the stock stop mechanism in the desired sequence as heretofore relative to the operation of the several mechanisms, it is made possible very materially to simplify and improve the operating and controlling mechanism for the stock stop member. More particularly, while the cam block is also materially reduced in size and cost, all need for slidably mounting such a block on the front end of the longitudinal tool carrier is eliminated, as well as all need for providing any special operative connection for sliding this camblock, such as was previously connected to the top thereof and between the latter and the main cam, while of course any need for a special cam track mechanism on the inside of the cam 8 is also eliminated. Instead, with the block I8 and follower I6 constructed and disposed as herein, it is made possible to utilize the same cam tracks onthe cam 8 which cooperate with the cam follower 9 on the longitudinal tool carrier Iii to eifect the reverse longitudinal movements of the latter, in order to effect the desired reverse lateral swinging movments of the stock stop member I2. Thus, withoutin any way interfering with the normal operation of the, stock stop, it is made possible not only to simplify the machine but also very substantially to reduce the cost thereof. In addition the threading of the stock stop member to the tube facilitates adjustment, while all necessity for providing an additional stationary stock tube between the rotatable tube and the cam 8 is also eliminated, as well as need for any stationaryv As a result, the roller or cani bracket between the sleeve I3 and the cam 3, it instead being possible herein to use a single longer outer tube or sleeve I3 enclosing the tube or sleeve I5 and extending between the head stock 3 and the hub of the main cam 8'. These and other advantages of my improved construction will, however, be clearly apparent to those skilled in the art.

While I have in this application specifically described one embodiment which my invention may assume in practice, it will be understood that this form of the same is shown for purposes of illustration, and that the invention may be modified and embodied in various other forms without departing from its spirit or the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent is:

l. In a machine tool, work rotating means including a spindle, means for intermittently feeding stock therein, coaxial longitudinally extending shaft means drivinfr said spindle and said stock feeding means, longitudinally reciprocable tool carrier means and shaft mea-ns also driven by one of said shaft means, swinging stock stop means journalled on said shaft means and having a depending actuating portion swinging therewith, and means on said reciprocable tool carrier for engaging said actuating portion and swinging said stop means positively in both directions in timed relation to said carrier and said feeding means.

2. In a machine tool, Work rotating means Vincluding a spindle, means for intermittently feeding stock therein, longitudinally extending shaft means driving said spindle and said stock feeding means, longitudinally reciprocable tool carrier means disposed below and driven by said shaft means, swinging stock stop means journalled on said shaft means having a depending actuating portion swinging therewith, and stationary cam means on the top of said reciprocable tool carrier for directly engaging said depending portion and swinging said stop means in timed relation to said carrier and said feeding means.

3. In a machine tool, work rotating means including a spindle, means for intermittently feeding stock therein, longitudinally reciprocable tool carrier means having an upstanding actuating member, driving means for said work rotating and feeding means including coaxial driving members extending longitudinally of the machine above said longitudinally reciprocable tool carrier means, one of said members also having cam means thereon engaging said actuating member and driving said carrier means, swinging stock stop means journalled on the outermost of said coaxial driving members having a depending actuating portion swinging therewith about the axis of said driving means, and stationary means on said reciprocable tool carrier for directly engaging said depending actuating portion and swinging said stop means in timed relation to said carrier and said feeding means.

4. In a machine tool, work rotating means including a spindle, means for intermittently feeding stock therein, coaxial driving members extending longitudinally of the machine and driving said work rotating means and said stock feeding means respectively, longitudinally reciprocable tool carrier means also driven by one of said members, swinging stock stop means having a depending actuating portion swinging therewith, and stationary cam slot means on said reciprocable tool carrier for receiving and actuating said actuating portion and swinging said stop means positively in both directions in timed relation to said carrier and said feeding means.

5. In a machine tool, work rotating means including parallel spindles, means for intermittently feeding stock therein, longitudinally extending drive means for said spindles and said stock feeding means, longitudinally reciprocable tool carrier means reciprocable beneath said spindles and said drive means carrying tools cooperating with work in said spindles, swinging stock stopmeans pivoted between said spindles, and cooperating means on said stock stop and on said reciprocable carrier located between the tools thereon for swinging said stop means into and out of stopping position in tim-ed relation te said carrier and said feeding means.

6. In a machine tool, work rotating means including parallel spindles, means for intermittently feeding stock therein, longitudinally reciprocable tool carrier means carrying tools cooperating with work in said spindles, driving means for said work rotating and feeding means extending longitudinally between said spindles, swinging stock stop means movable about the axis of said driving means, and cooperating means on said stock stop means and on said carrier located between the tools on said carrier and beneath said driving means for swinging said stop means into and out of stopping position in timed relation to said carrier and said feeding means.

7. In a machine tool, work rotating means in-` cluding parallel spindles, means for intermittently feeding stock therein, longitudinally reciprocable tool carrier means carrying tools cooperating with work in said spindles, driving means for said work rotating and feeding means extending longitudinally between said spindles above said carrier, swinging stock stop means movable about the axis of said driving means including a depending portion below said driving means, and cam means on said carrier means between the tools thereon for actuating said depending portion and swinging said stock stop means.

8. In a machine tool, driving means, swinging stock stop means rotatable about the axis of said driving means, a reciprocable tool carrier reciprocable beneath said driving means, and cooperating means on said stock stop means and carrier and disposed beneath said driving means for operating said stock stop means.

9. In a machine tool, driving means, swinging stock stop means rotatable about the axis of said driving means, a reciprocable tool carrier reciprocable beneath said driving means, and cooperating means beneath said driving means for operating said stock stop means including an element rotatable about the axis of said stock stop means and a cooperating actuating element therefor reciprocable with said carrier.

10. In a machine tool, driving means, swinging stock stop means rotatable about the axis of said driving means, a reciprocable tool carrier reciprocable beneath said driving means, and cooperating means for operating said stock stop means including a depending portion rotatable with said stock stop means, and cam means xed to said carrier and en-gaging and actuating said depending portion.

l1. In a machine tool, driving means including a main cam and drive shaft means extending axially from said cam, a tool carrier reciprocated by said cam beneath said drive shaft means, a rotatable sleeve enclosing said driving means, stock stop means rotatable with said sleeve, and operative connections between said sleeve and carrier for operating said stock stop means in timed relation to said carrier.

12. In a machine tool, driving means including a main cam and drive shaft means extending axially from said cam, a tool carrier reciprocated by said cam beneath said drive shaft means, a rotatable sleeve enclosing said drivin-g means, stock stop means rotatable with said sleeve, and operative connections between said sleeve and carrier for operating said stock stop means in timed relation to said carrier including cooperating cam and cam follower means.

13. In a machine tool, driving means including a main cam and drive shaft means extending axially from said cam, a tool carrier reciprocated by said cam beneath said drive shaft means, a rotatable sleeve enclosing said driving means, stock stop means rotatable with said sleeve, and operating means on said sleeve and said carrier for operating said stock stop means in timed relation to said carrier, said stock stop means being threaded on said sleeve and longitudinally adjustable relative to the operating means on said sleeve.

14. In a machine tool, driving means including a main cam and drive shaft means extending axially from said cam, a tool carrier reciprocated by said cam beneath said drive shaft means, a rotatable sleeve enclosing said driving means, stock stop means rotatable with said sleeve, and operating means on said sleeve and said carrier for operating said stock stop means, said rotatable sleeve extending in opposite directions substantially beyond said operating means on said sleeve and into adjacency to said main cam.

ELMER E. KELLEY.

CERTIFICATE 0F CORRECTION. Pitent No. 2,299,650. october 2C, 19m..

ELI/1ER E. KELLEY.

` x It is hereby certified that error appeers in the printed specification cof the above numbered patent requiring correction as follows: Page l, second column, line 5h., for "end" read --and-; page 2, second column, line 214., claim l, for "and shaft" read --below said Shaftn; and that the said Letters Patent should be read with this correction therein that the same may Conform to the record of the case in the Patent Office.

signed and enea-this 21ml day of November, A. D. I9LI2. l

Henr;T Van Arsdale, (Seal) Acting Commissioner of Patents. 

